No Sound Fix for Your Embedded YouTube Video

Sometimes the embedded (chromeless) YouTube player will fall silent on video playback for an apparently unexplained reason, with no immediate way to fix. I think it has to do with YouTube/flash caching muted sound settings from youtube.com or other non-chromeless player and somewhere along the way these are carried over to your chromeless video.

Just include these two calls in the javascript player prior to calling playVideo():
player.unMute();
player.setVolume(10);